Stools



April 6, 1965 R. 'r. HALSTRICK 3,177,035

STOOLS I Original Filed May 2, 1963 2 Sheets-Sheet 1 INVENTOR. ROBERT 7.HALSTfl/CK BY fil ATTORNEY April 6, 1965 R. T. HALSTRXCK 3,177,035

STOOLS Original Filed May 2, 1963 2 Sheets-Sheet 2 Eg n 4/\ 46 INVENTOR.ROBERT Z HALSTR/CK ATTORNEY United States Patent 3,177,035 STOOLS RobertT. Halstrick, Huntingdon Valley, Pa, assignor to American Metal Works,Inc., Philadelphia, Pa, a corporation of Pennsylvania Originalapplication May 2, 1963, Ser. No. 277,546. Divided and this applicationNov. 22, 1963, Ser. No. 325,602

1 Claim. (Cl. 297-451) This invention relates to stools primarily forshop use and is division of my prior application filed May 2, 1963,Serial No. 277,546.

Stools used in work shops frequently require adjustments as to heightupon change of shift or upon change of the operations to be performed.Such stools also, are frequently provided with or workers desire theattachment thereto of adjustable backrests.

It is the principal object of the present invention to provideimprovements in stools for industrial or shop use with which a quickadjustment of seat height can be effected.

It is a further object of the present invention to provide improvementsin stools for industrial or shop use having a self-locking heightadjustment of the stool seat.

It is a further object of the present invention to provide a stoolhaving a self-locking height adjustment which can be easily unlocked forsetting to a different height.

It is a further object of the present invention to provide a stool and aback rest therefor which is quickly and easily applied.

It is a further object of the present invention to provide a stool andback rest of the character aforesaid which is quickly and easilyadjustable with simultaneous adjustment of the back rest angle andlocking of the adjustment at any desired angle.

Other objects and advantageous features of the invention will beapparent from the description and claim.

The nature and characteristic features of the invention will be morereadily understood from the following description taken in connectionwith the accompanying drawings forming part thereof, in which:

FIGURE 1 is a view in perspective of a stool in accordance with theinvention;

FIG. 2 is a horizontal sectional view, enlarged, taken approximately onthe line 22 of FIG. 1;

FIG. 3 is a vertical sectional view, further enlarged, takenapproximately on the line 33 of FIG. 2;

FIG. 4 is a horizontal sectional view, still further enlarged, takenapproximately on the line 4-4 of FIG. 3;

FIG. 5 is a perspective view of a locking pin for height adjustment ofthe legs;

FIG. 6 is a side elevational view of the stool shown in FIG. 1 with theback rest in place;

FIG. 7 is an enlarged fragmentary horizontal View showing the details ofthe mounting of the back rest;

FIG. 8 is a fragmentary sectional view, enlarged, taken approximately onthe line 88 of FIG. 7; and

FIG. 9 is an exploded perspective view of the structure shown in FIGS.6, 7 and 8.

It should, of course, be understood that the description and drawingsherein are illustrative merely and that various modifications andchanges can be made in the structure disclosed without departing fromthe spirit of the invention.

Like numerals refer to like parts throughout the several views.

Referring now more particularly to FIGS. l to 5, inclusive, of thedrawings, a stool 15 is shown having a seat 16, of wood or otherpreferred material from which main legs 17 extend downwardly andoutwardly.

3,l??,35 Patented Apr. 6, 1%65 At the lower ends of the main legs 17 ahorizontal lower bracing frame 18 is provided, having horizontal wallportions 19 and vertical wall portions 2t and with an open central space21.

Each of the main legs 17 is preferably formed as a metal stamping ofchannel section with a web 22 and side flanges 23 providing a squarecross section. Rims 24 extend outwardly, in flared relation to the sideflanges 23 for stiffening.

The wall portions 19 and 20 extend to and engage with the rims 23, andaresecured thereto in any desired manner, such as by spot welding. Theframe 18, at the corners, has openings 25 for the passage of legextension tubes 26. The leg extension tubes 26 can be of any desiredcross section but are preferably circular. At the lower ends of thetubes 26, rubber tips 27 can be provided if desired.

In order to position the tubes 26 longitudinally with respect to themain legs 17 the main legs 17, in spaced relation above the lower edge28 thereof, are provided with opposite vertically elongated rectangularslot 29, the axis of the slots 29 preferably being vertical or plumb andaccordingly in tilted relation to the web portions 22.

The extension tubes 26, at spaced locations, are preferably providedwith opposite square openings 36, tilted with respect to thelongitudinal axis of the tubes 26, and for selective alignment with theslots 29. Locking pins 32, insertable through the slots 29 and through apair of openings 36 in the tubes 26, permit of height regulation of theseat 16.

A contiguous pair of main legs 17, at one side, are each provided withvertically spaced openings 33 for the attachment of back rest supporthangers or sockets 35 by bolts 36.

The back rest structure, shown in detail in FIGS. 6 to 9, inclusive,includes a back support frame 38 of round wire having spaced downwardlyextending lower ends 3d which engage in the hangers 35. The frame 38 hasopposite rearwardly and upwardly extending portions so, uprightconverging portions 41, horizontal forwardly extending arms 42 and ahorizontal connecting and clamping rod portion 43.

The back rest 45, of any preferred shape, and preferably with aninterior metal plate 46 covered with padding 47, is shown as arcuate inhorizontal section.

A hanger 49 preferably made of a metallic strip has securing portions 50shaped to conform to the rear of the plate 46, has rearwardly extendingside sections 51, and

' a central section 52. Extending from the securing portions 51angularly disposed or flared stops 53 are provided.

The central section 52 has a horizontal slot 54 therealong which extendsinto and forwardly along the side sections 51. The slot 54, intermediateits ends, has an enlarged opening 55 for the insertion of the head 56 ofa bolt 57. A pair of bolts 57 extend forwardly through openings 58 inthe body of a clamping cap 59. The cap 59 has rearwardly extendingclamping arms 60 which extend along the side sections 51 and haverecesses 61 to engage the rod portion 43 of the frame 38. Wing nuts 62,on the bolts 57 permit of tightening the cap 59 to the desired extentwith the back rest 45 at a selected position in pivotal adjustment onthe rod portion 43. The cap 59 preferably also has upper and lower rims63 to facilitate the positioning of the cap 59.

It will thus be seen that the seat 16 can be adjusted to the desiredheight by insertion of the pins 32 through the slots 29 and selectedopenings 39. The weight of the user on the seat 16, by the downwardforce applied therefrom through the main legs 17 and the correspondingupward force applied through the tubes 26 effects a locking of the tubesas and legs 17. The lock can be released by a blow struck against thetops of the tubes 26 above the frame. V The back rest 45 can be readilymounted on the back support frame, 38. For this purpose, the hanger 49has the clamping rod portion 43 inserted thereinto and posi tionedsidewise by the flared stops 53. The bolts 57 are inserted into the slot54. The enlarged opening 55 permits successive insertion of the boltheads 56 and sliding ofthebolts 57 away from the opening 55 on eachside.

a The clamping cap 59 is then put in place with the bolts 57 extendingthrough the openings 58 and with the clamping arms 60 engaging theclamping rod 43 at the recesses 61. The Wing nuts 62 are then applied tothe bolts 57.

The back rest 45 is then tilted as desired and adjustably locked inposition upon tightening of the wing nuts 62.

I claim: A- stool having a seat, supporting legs for said seat, backrest support hangers mounted on a contiguous pair carried in saidsupport hangers, said frame having a horizontal clamping rodportionsupported above said seat, a

V of saidlegs, a back support frame having its lower ends t back seathaving a hanger with side sections extending horizontally therefrom witha central section connecting said side sections, said central and sidesections having a slot for the reception of said clamping rod portion, aclamping cap engaging said clamping rod portion, bolts engaging saidcentral section and said clamping cap and holding said clamping cap inclamped engagement with said clamping rod portion, said slot in saidcentral section having an enlarged opening for insertion of the heads ofsaid bolts, said hanger comprising a strip of material with side stops,and attaching portions between the side sections and the side stops andconnected to the back rest.

References Cited by the Examiner UNITED STATES PATENTS 1,407,896 2/22Spitz 2 4823O 2,625,358 1/53 Griffin a 248-,226;4 2,711,787 6/55HalloWell et a1. 297451 2,876,828 3/59 Mayer 297-451 FRANK B. SHERRY,Primary Examiner.

